This is the story of fifth century CE India, when the Yogacarin Buddhists tested the awareness of unawareness, and became aware of human unawareness to an extraordinary degree. This important study reveals how the Buddhist unconscious illuminates and draws out aspects of current western thinking on the unconscious mind. One of the most intriguing connections is the idea that there is in fact no substantial 'self' underlying all mental activity; 'the thoughts themselves are the thinker'. William S. Waldron considers the implications of this radical notion, which, despite only recently gaining plausibility, was in fact first posited 2,500 years ago.